Number 100000

### 1.1. Knowledge to remember

### 1.2. Solving Textbook Exercises

**Lesson 1:** Number ?

a) 10 000; 20 000; … ; … ;50 000; … ; … ;80 000; … ;100 000

b) 10 000; 11 000; 12 000; … ; … ; … ;16 000; … ; … ; … ; …

c) 18 000; 18 100; 18 200; … ; … ; … ; … ; 18 700; … ; … ; …

d) 18 235; 18 236; … ; … ; … ; …

**Solution guide:**

- Count the number of consecutive thousand, round, or consecutive numbers and fill in the blanks.

a) 10 000; 20 000; 30 000; 40 000; 50 000; 60 000; 70 000 ;80 000; 90 000; 100 000.

b) 10 000; 11 000; 12 000; 13 000; 14 000; 15 000 ;16 000; 17 000; 18 000; 19 000; 20 000.

c) 18 000; 18 100; 18 200; 18 300; 18 400; 18 500; 18 600; 18 700; 18 800; 18 900; 19 000.

d) 18 235; 18 236; 18 237; 18 238; 18 239; 18 240.

**Lesson 2:** Write the correct number below each line

__Solution guide:__

Count by 10 000 units, starting from 40 000 and then fill in the missing number under each line.

**Lesson 3:** Number ?

Previous number | Number given | Next number |

12 534 | ||

43 905 | ||

62 307 | ||

39 999 | ||

99 999 |

__Solution guide:__

- The preceding number of a is one less than a.
- The next number of a is worth one more than a.

Previous number | Number given | Next number |

12 533 | 12 534 | 12 535 |

43 904 | 43 905 | 43 906 |

62 306 | 62 307 | 62 308 |

39 998 | 39 999 | 40 000 won |

99 998 | 99 999 | 100 000 won |

**Lesson 4:** A stadium with 7000 seats, 5000 people came to watch football. How many unoccupied seats does that stadium have?

__Solution guide:__

*Summary:*

All: 7000 seats

Seated: 5000 seats

Rest: ? seat.

To find out how many seats are left in that stadium, we subtract 7000 from the number of seats already occupied.

*Solution*

The number of unoccupied seats is:

7000 – 5000 = 2000 (seats)

Answer: 2000 seats.

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